title: Assay of urinary excretion of polyphenols after ingestion of a cup of mountain tea (Sideritis scardica) measured by HPLC-DAD-ESI-MS/MS.
abstract: Flavonoids and phenolic acid metabolites excreted in human urine after ingestion of Sideritis scardica decoction with characterized polyphenolic composition were studied. A feeding study was carried out with 10 human volunteers, and urine samples were collected for 24 h after ingestion of the Sidertis decoction. Polyphenol metabolites were identified and quantified in urine samples by HPLC with tandem mass spectrometric detection. Thirty-one different metabolites of hypolaetin, methylhypolaetin, isoscutellarein, methylisoscutellarein, and apigenin and 32 phenolic acid metabolites were detected and quantified using a method validated for this purpose. The urinary excretion of polyphenol metabolites corresponded to 5% (n/n) of the intake of polyphenols from the Sideritis decoction. Flavonoid metabolites were dominant in urine samples with 87-94% of total polyphenolic metabolites content. The most abundant metabolites were methylhypolaetin and methylisoscutellarein glucuronides. Urinary excretion of isoscutellarein (35.61%) was 10 times higher than that of hypolaetin (3.67%). Apigenin also showed high urinary excretion (32.46%).
authors.affiliation: Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss. Cyril and Methodius University , Arhimedova 5, 1000 Skopje, Republic of Macedonia.
authors.forename: Jasmina
authors.initials: J
authors.lastname: Petreska Stanoeva
authors.forename: Marina
authors.initials: M
authors.lastname: Stefova
mesh_terms: D000328:Adult; D001628:Beverages / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D004435:Eating; D005260:Female; D006801:Humans; D008297:Male; D010936:Plant Extracts / Q000378:metabolism / Q000652:urine*; D059808:Polyphenols / Q000378:metabolism / Q000652:urine*; D031365:Sideritis / Q000378:metabolism*; D053719:Tandem Mass Spectrometry / Q000379:methods; D055815:Young Adult
chemical_list: D010936:Plant Extracts; D059808:Polyphenols